A hot air circulation type agricultural product drying device

Abstract

The utility model relates to the technical field of agricultural product drying device, put forward a kind of hot air circulation formula agricultural product drying device, including drying chamber, still include: heating chamber, the heating chamber is equipped with combustion furnace and heat exchanger;Exhaust mechanism, the exhaust mechanism is used to drive the high-temperature flue gas generated by combustion furnace into heat exchanger and discharge to heating chamber outside, and combustion furnace smoke outlet, the air inlet end of heat exchanger, the air outlet end and exhaust mechanism air inlet are sequentially communicated and form exhaust passage;Hot air conveying mechanism, the hot air conveying mechanism is used to drive the cold wind of heating chamber and heat exchanger high-temperature flue gas heat exchange, to form the hot air conveyed to drying chamber, heating chamber inner chamber, hot air conveying mechanism input end, output end and drying chamber sequentially communicate and form hot air conveying channel;The drying chamber is communicated heating chamber, and the hot air into drying chamber returns heating chamber heating, forms hot air circulation air duct.The hot air conveying mechanism is conveyed to drying chamber after heating air, to dry agricultural products.

Description

Technical Field

[0001] This utility model relates to the technical field of agricultural product drying devices, specifically to a hot air circulating agricultural product drying device. Background Technology

[0002] Agricultural products typically contain high moisture content after harvest. If not dried promptly, they are highly susceptible to mold and rot, leading to a decline in quality and even complete loss of economic value. Traditional natural sun-drying methods rely on weather conditions, are not only inefficient but also easily contaminated by dust, pests, and microorganisms, failing to meet the quality and hygiene requirements of modern agricultural production. Therefore, mechanized hot air drying technology has become a crucial step in agricultural product processing, widely applied to the drying of various agricultural products such as grains, fruits and vegetables, medicinal herbs, and edible fungi. Utility Model Content

[0003] This invention proposes a hot air circulating agricultural product drying device. A combustion furnace in the heating chamber generates high-temperature flue gas, which exchanges heat with cold air through a heat exchanger to form a stable hot air source. An exhaust mechanism ensures that the high-temperature flue gas is effectively discharged after heat exchange. A hot air conveying mechanism transports the heated air to the drying chamber to dry the agricultural product, specifically dried mustard greens.

[0004] A hot air circulating agricultural product drying device designed for this purpose includes a drying chamber, and further includes: A heating chamber, wherein a combustion furnace and a heat exchanger are provided; The exhaust mechanism is used to drive the high-temperature flue gas generated by the combustion furnace into the heat exchanger and discharge it to the outside of the heating room. The flue gas outlet of the combustion furnace, the air inlet end and the air outlet end of the heat exchanger are sequentially connected to the air inlet of the exhaust mechanism to form an exhaust channel. The hot air conveying mechanism is used to drive the cold air in the heating chamber to exchange heat with the high-temperature flue gas in the heat exchanger to form hot air to be conveyed to the drying chamber. The inner cavity of the heating chamber, the input end and the output end of the hot air conveying mechanism are sequentially connected to the drying chamber to form a hot air conveying channel. The drying chamber is connected to the heating chamber, and the hot air entering the drying chamber returns to the heating chamber for reheating, forming a hot air circulation duct.

[0005] The heat exchanger is located above the combustion furnace; The heat exchanger includes a first ventilation seat and a second ventilation seat. Several vertical and horizontal ventilation pipes are provided between the first ventilation seat and the second ventilation seat. Ventilation chambers are provided in the first ventilation seat and the second ventilation seat at intervals. The two ends of the ventilation pipes are connected to independent corresponding ventilation chambers so that a meandering heat exchange channel is formed in the heat exchanger. Gas flows from the lower ventilation pipe to the upper ventilation pipe in sequence. The first ventilation seat is fixedly connected to and communicates with the top opening of the combustion furnace; The second ventilation seat is fixedly connected to the outer side of the top of the combustion furnace and communicates with the air inlet of the exhaust mechanism; The combustion furnace generates high-temperature flue gas, which flows through the meandering heat exchange channel in the heat exchanger under the traction of the exhaust mechanism and is finally discharged by the exhaust mechanism.

[0006] The first ventilation seat and / or the second ventilation seat are provided with a sealing door that can be opened and closed, and the first ventilation seat and / or the second ventilation seat are provided with a first door lock structure for unlocking or locking the door.

[0007] The combustion furnace is provided with a combustion chamber, and a material conveying mechanism is provided on the outside of the combustion chamber; The material conveying mechanism includes a material cylinder and a feeding screw rotatably disposed inside the material cylinder. The material cylinder has an opening, and a feeding bin for discharging combustibles is fixed on the opening. The material conveying mechanism also includes a movable frame with a set of movable wheels at the bottom. The material cylinder is fixed on the movable frame, and the discharge end of the material conveying mechanism is inserted into or moved away from the combustion furnace through the movable frame.

[0008] The combustion furnace is provided with an ignition chamber located below the combustion chamber, and a metal ventilation grille is provided between the ignition chamber and the combustion chamber.

[0009] The exhaust mechanism includes a flue pipe, a fan, and a smoke exhaust pipe. The air inlet of the fan casing is connected to the first end of the flue pipe, and the second end of the flue pipe is connected to and communicates with the second ventilation seat of the heat exchanger. The smoke exhaust pipe is connected to the air outlet of the fan casing.

[0010] The hot air conveying mechanism includes an air supply pipe, an air supply fan, and a fan mounting base. The first end of the air supply pipe is connected to the heating chamber, and the other end of the air supply pipe is connected to the drying chamber. The first end of the fan mounting base is fixed to the upper part of the heating chamber, the second end of the fan mounting base is fixed to the air supply pipe, and the air supply fan is fixed inside the fan mounting base.

[0011] The air supply pipe is inserted into the drying chamber, and several air outlet pipes are provided on the outside of the air supply pipe. One end of the air outlet pipe is connected to the air supply pipe, and the other end of the air outlet pipe is connected to the drying chamber. The hot air in the air supply pipe flows out along the several air outlet pipes and is output into the drying chamber.

[0012] An internal pipe is provided between the lower part of the drying chamber and the lower part of the heating chamber, and the internal pipe connects the drying chamber and the heating chamber so that the hot air in the drying chamber returns to the heating chamber along the internal pipe; The top wall of the drying chamber is equipped with a fan to promote airflow, and the fan blows air downwards towards the lower part of the drying chamber.

[0013] The drying chamber is provided with a smoke exhaust seat that connects the outside and inside of the drying chamber. The smoke exhaust seat is located at the top of the drying chamber; or the smoke exhaust seat is located near the outside of the lower part of the drying chamber. The drying chamber is provided with two doors on its side, and a second door lock structure for locking or unlocking the doors is provided between the two doors. The drying chamber is equipped with casters at the bottom; The heating chamber is equipped with a rotating door plate corresponding to the heat exchanger, and a third door lock structure for locking or unlocking the rotating door plate.

[0014] The beneficial technical effects of this utility model are as follows: By incorporating a drying chamber, a heating chamber, an exhaust system, and a hot air conveying system, the combustion furnace in the heating chamber generates high-temperature flue gas, which exchanges heat with cold air through a heat exchanger to form a stable hot air source. The exhaust system ensures that the high-temperature flue gas is effectively discharged after heat exchange. The hot air conveying system transports the heated air to the drying chamber to dry agricultural products, specifically dried vegetables. The circulating air duct design between the drying chamber and the heating chamber allows some of the hot air to return to the heating chamber for reheating, significantly reducing energy consumption. Attached Figure Description

[0015] Figure 1 This is a three-dimensional cross-sectional structural diagram of an agricultural product drying device according to an embodiment of the present invention.

[0016] Figure 2 This is a three-dimensional cross-sectional structural diagram of the heating chamber according to an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of a three-dimensional cross-sectional structure of an agricultural product drying device according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the three-dimensional cross-sectional structure of the heating chamber in another aspect of an embodiment of the present invention.

[0019] Figure 5 This is a three-dimensional structural diagram of an agricultural product drying device according to an embodiment of the present invention.

[0020] Figure 6 This is a three-dimensional structural diagram of an agricultural product drying device according to an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0022] See Figures 1-6 A hot air circulating agricultural product drying device includes a drying chamber 1, and further includes: Heating chamber 2, wherein a combustion furnace 3 and a heat exchanger 4 are provided; The exhaust mechanism 5 is used to drive the high-temperature flue gas generated by the combustion furnace 3 into the heat exchanger 4 and discharge it to the outside of the heating chamber 2. The flue gas outlet of the combustion furnace 3, the air inlet end and the air outlet end of the heat exchanger 4 are connected to the air inlet of the exhaust mechanism 5 in sequence to form an exhaust channel. Hot air conveying mechanism 6 is used to drive the cold air in heating chamber 2 to exchange heat with the high temperature flue gas in heat exchanger 4, so as to form hot air to be conveyed to drying chamber 1. The inner cavity of heating chamber 2, the input end and the output end of hot air conveying mechanism 6 are connected to drying chamber 1 in sequence to form a hot air conveying channel. The drying chamber 1 is connected to the heating chamber 2. Hot air entering the drying chamber returns to the heating chamber 2 for heating, forming a hot air circulation duct.

[0023] By configuring a drying chamber 1, a heating chamber 2, an exhaust system 5, and a hot air conveying system 6, the combustion furnace 3 in the heating chamber 2 generates high-temperature flue gas, which exchanges heat with cold air through a heat exchanger 4, forming a stable hot air source. The exhaust system 5 ensures that the high-temperature flue gas is effectively discharged after heat exchange. The hot air conveying system 6 transports the heated air to the drying chamber 1 to dry agricultural products, specifically dried vegetables. The circulating air duct design between the drying chamber 1 and the heating chamber 2 allows some of the hot air to return to the heating chamber 2 for reheating, significantly reducing energy consumption.

[0024] The heat exchanger 4 is located above the combustion furnace 3; The heat exchanger 4 includes a first ventilation seat 401 and a second ventilation seat 402. A plurality of vertically and horizontally arranged vent pipes 403 are provided between the first ventilation seat 401 and the second ventilation seat 402. Ventilation chambers are provided in the first ventilation seat 401 and the second ventilation seat 402 at intervals. The two ends of the vent pipes 403 are connected to independent corresponding ventilation chambers, so that a meandering heat exchange channel is formed in the heat exchanger 4. Gas flows from the lower vent pipe 403 to the upper vent pipe 403 in sequence. The first ventilation seat 401 is fixedly connected to and communicates with the top opening of the combustion furnace 3; The second ventilation seat 402 is fixedly connected to the outer side of the top of the combustion furnace 3 and communicates with the air inlet of the exhaust mechanism 5; The high-temperature flue gas generated by the combustion furnace 3 flows through the meandering heat exchange channel in the heat exchanger 4 under the traction of the exhaust mechanism 5 and is finally discharged by the exhaust mechanism 5.

[0025] By placing the heat exchanger 4 above the combustion furnace 3 and employing a meandering heat exchange channel composed of a first ventilation seat 401, a second ventilation seat 402, and multiple layers of ventilation pipes 403, the flow path and heat exchange time of the high-temperature flue gas are significantly extended. The flue gas flows upward layer by layer from the lower ventilation pipe 403, making full contact with the cold air, thus greatly improving the heat exchange efficiency. The first ventilation seat 401 is directly connected to the top of the combustion furnace 3, satisfying the flue gas exhaust path, and the upward flow of hot gas facilitates its entry into the first ventilation seat 401; the second ventilation seat 402 is connected to the exhaust mechanism 5, ensuring smooth exhaust of the waste gas.

[0026] Specifically, the flue gas flows from the lower vent pipe 403 of the first partition cavity of the first ventilation seat 401 to the second partition cavity of the second ventilation seat 402. The flue gas in the second ventilation seat 402 flows along the upper vent pipe 403 to the third partition cavity of the first ventilation seat 401, and the flue gas in the first ventilation seat 401 flows along the upper vent pipe 403 to the fourth partition cavity of the second ventilation seat 402, thus forming a circuitous heat exchange channel. Finally, it is discharged by the exhaust mechanism 5. The first ventilation seat 401 and / or the second ventilation seat 402 are provided with a sealing door 404 that can be opened and closed, and the first ventilation seat 401 and / or the second ventilation seat 402 are provided with a first door lock structure 405 for unlocking or locking the door 404.

[0027] The addition of a sealing door 404 and a first door lock structure 405 to the first ventilation seat 401 and / or the second ventilation seat 402 greatly improves the maintainability and safety of the equipment. The sealing door 404 facilitates regular cleaning of accumulated dust inside the heat exchanger 4 or checking for blockages in the vent pipe 403, ensuring consistently stable heat exchange efficiency. The first door lock structure 405 securely locks the door 404, preventing high-temperature flue gas leakage and ensuring operator safety. The sealing door structure further optimizes the airtightness of the hot air circulation system, preventing heat loss.

[0028] The first door lock structure 405 includes a screw rod that passes through the inner side of the sealing door body 404 and the ventilation seat, and a handwheel located on the outer side of the sealing door body 404. The handwheel is welded to the screw rod. When the sealing door body 404 is closed, the handwheel of the first door lock structure 405 rotates to abut against the outer side of the sealing door body 404, and the screw rod is threadedly connected to the inner side of the ventilation seat to lock the sealing door body 404. When the handwheel rotates in the opposite direction, the handwheel drives the screw rod to disengage from the ventilation seat, thereby unlocking the door.

[0029] The door seal body 404 is provided with a sealing flange that abuts against the outer side of the ventilation seat opening to prevent smoke leakage. A sealing ring is provided on the sealing flange.

[0030] The combustion furnace 3 is provided with a combustion chamber 301 inside, and a material conveying mechanism 7 is provided on the outside of the combustion chamber 301. The material conveying mechanism 7 includes a material cylinder 701 and a feeding screw 702 rotatably disposed in the material cylinder 701. The material cylinder 701 has an opening, and a feeding bin 703 for discharging combustibles is fixed on the opening. The material conveying mechanism 7 also includes a movable frame 704 with movable wheels at the bottom. The material cylinder 701 is fixed on the movable frame 704, and the discharge end of the material conveying mechanism 7 is inserted into or moved away from the combustion furnace 3 through the movable frame 704.

[0031] The material conveying mechanism 7 achieves automated conveying, avoiding direct manual feeding into the combustion furnace 3. The combined design of the material cylinder 701 and the feeding screw 702 can convey biomass pellets or coal and other combustibles, avoiding the instability of manual feeding. The cooperation between the moving frame 704 and the moving wheel set allows the entire material conveying mechanism 7 to be flexibly pushed into or away from the combustion furnace 3, facilitating equipment maintenance and cleaning of the combustion furnace 3.

[0032] The combustion furnace 3 is provided with an ignition chamber 302, which is located below the combustion chamber 301, and a metal ventilation grille 303 is provided between the ignition chamber 302 and the combustion chamber 301.

[0033] The ignition chamber 302 is located below the combustion chamber 301. The grid structure can both support the fuel layer and transmit the flame to the combustion chamber 301 above.

[0034] The exhaust mechanism 5 includes a smoke outlet pipe 501, a fan 502 and a smoke exhaust pipe 503. The air inlet of the fan 502 is connected to the first end of the smoke outlet pipe 501, and the second end of the smoke outlet pipe 501 is connected to and communicates with the second ventilation seat 402 of the heat exchanger 4. The smoke exhaust pipe 503 is connected to the air outlet of the fan 502.

[0035] Through the coordinated action of the flue pipe 501, fan 502, and exhaust pipe 503, directional emission of high-temperature flue gas is achieved. The air inlet of the volute of fan 502 is connected to the flue pipe 501, ensuring that the flue gas is efficiently extracted from the second ventilation seat 402 of heat exchanger 4; the exhaust pipe 503 concentrates the exhaust gas and leads it out of the heating chamber 2, preventing the exhaust gas from flowing back and affecting the heat exchange efficiency. This forced exhaust design not only improves the negative pressure stability of the combustion furnace 3, but also allows for flexible control of the exhaust volume through the speed regulation function of fan 502, adapting to different drying load requirements. The overall exhaust path is simple and efficient, reducing the risk of ash accumulation in the pipes and lowering maintenance costs.

[0036] The hot air conveying mechanism 6 includes an air supply pipe 601, an air supply fan 602, and a fan mounting base 603. The first end of the air supply pipe 601 is connected to the heating chamber 2, and the other end of the air supply pipe 601 is connected to the drying chamber 1. The first end of the fan mounting base 603 is fixed to the upper part of the heating chamber 2, and the second end of the fan mounting base 603 is fixed to the air supply pipe 601. The air supply fan 602 is fixed inside the fan mounting base 603.

[0037] The air supply pipe 601 is inserted into the drying chamber 1, and several air outlet pipes 604 are provided on the outside of the air supply pipe 601. One end of the air outlet pipe 604 is connected to the air supply pipe 601, and the other end of the air outlet pipe 604 is connected to the drying chamber 1. The hot air in the air supply pipe 601 flows out along the several air outlet pipes 604 and is output to the drying chamber 1.

[0038] The combination of the air supply duct 601, the air supply fan 602, and the fan mounting base 603 achieves efficient hot air delivery. The air supply duct 601 directly connects the heating chamber 2 and the drying chamber 1, shortening the hot air transmission path and reducing heat loss. The fan mounting base 603 securely mounts the air supply fan 602 on the upper part of the heating chamber 2, allowing the heated cold air to enter the drying chamber 1 along the air supply fan 602. The forced air delivery function of the air supply fan 602 ensures that the hot air enters the drying chamber 1 at a stable flow rate, forming a uniform airflow distribution.

[0039] An internal pipe 8 is provided between the lower part of the drying chamber 1 and the lower part of the heating chamber 2. The internal pipe 8 connects the drying chamber 1 and the heating chamber 2 so that the hot air in the drying chamber 1 returns to the heating chamber 2 along the internal pipe 8. The top wall of the drying chamber 1 is equipped with a fan 9 to promote airflow, and the fan 9 blows air downwards towards the lower part of the drying chamber 1.

[0040] Hot air is dispersed from the air supply duct 601 through multiple air outlet ducts 604, forming a multi-directional airflow. This diversion design is particularly suitable for large drying chambers 1, ensuring that agricultural products in different locations are heated evenly.

[0041] The drying chamber 1 is provided with a smoke exhaust seat 101 that connects the outside and the inside of the drying chamber 1. The smoke exhaust seat 101 is located at the top of the drying chamber 1; or the smoke exhaust seat 101 is located close to the outside of the lower part of the drying chamber 1. The drying chamber 1 has a door 102 on its side. There are two doors 102, and a second door lock structure for locking or unlocking the doors is provided between the two doors 102. The bottom of the drying chamber 1 is equipped with casters 103; The heating chamber 2 is provided with a rotating door plate 201 corresponding to the heat exchanger 4, and a third door lock structure for locking or unlocking the rotating door plate 201.

[0042] The second and third door lock structures can employ a swinging lock bar or a rotating lock block. The lock bar or lock block enters the lock groove to achieve locking, and when the lock bar or lock block disengages from the lock groove, it unlocks.

[0043] The airflow organization of the hot air circulation system is enhanced through the cooperation of internal duct 8 and fan 9. Internal duct 8 connects the lower part of drying chamber 1 and heating chamber 2. Fan 9 at the top of drying chamber 1 blows air downwards, forcibly driving hot air to flow towards the agricultural products below, and the hot air enters heating chamber 2 along the internal duct 8 below.

[0044] The combination of the exhaust vent 101, door 102, and casters 103 enhances the practicality and flexibility of the equipment. The exhaust vent 101 can be installed at the top or bottom of the drying chamber 1 as needed to expel excess heat and maintain internal pressure balance. The two doors 102 are designed for easy material loading and unloading, and the second door lock structure ensures the airtightness of the drying process. The casters 103 allow for flexible movement of the entire unit, and the rotating door 201 of the heating chamber 2 and the third door lock structure facilitate maintenance of the combustion furnace 3 or heat exchanger 4, ensuring high operational safety. These detailed design features significantly improve the ease of use and adaptability of the equipment.

[0045] The two doors 102 can be opened and closed by hinges, and the rotating door panel 201 can also be rotated outside the heating chamber 2 by hinges.

[0046] The drying chamber 1 may be equipped with support rods for supporting the racks, and agricultural products are placed on the racks.

[0047] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A hot air circulating agricultural product drying device, comprising a drying chamber (1), characterized in that, Also includes: Heating chamber (2), wherein a combustion furnace (3) and a heat exchanger (4) are provided in the heating chamber (2); The exhaust mechanism (5) is used to drive the high-temperature flue gas generated by the combustion furnace (3) into the heat exchanger (4) and discharge it to the outside of the heating chamber (2). The exhaust port of the combustion furnace (3), the air inlet end and the air outlet end of the heat exchanger (4) are connected to the air inlet of the exhaust mechanism (5) in sequence to form an exhaust channel. Hot air conveying mechanism (6) is used to drive the cold air in the heating chamber (2) to exchange heat with the high temperature flue gas in the heat exchanger (4) to form hot air to be conveyed to the drying chamber (1). The inner cavity of the heating chamber (2), the input end and the output end of the hot air conveying mechanism (6) are connected to the drying chamber (1) in sequence to form a hot air conveying channel. The drying chamber (1) is connected to the heating chamber (2), and the hot air entering the drying chamber returns to the heating chamber (2) for heating, forming a hot air circulation duct.

2. The hot air circulating agricultural product drying device according to claim 1, characterized in that: The heat exchanger (4) is located above the combustion furnace (3); The heat exchanger (4) includes a first ventilation seat (401) and a second ventilation seat (402). A plurality of vertical and horizontal ventilation pipes (403) are provided between the first ventilation seat (401) and the second ventilation seat (402). Ventilation chambers are provided in the first ventilation seat (401) and the second ventilation seat (402) at intervals. The two ends of the ventilation pipes (403) are connected to independent corresponding ventilation chambers so that a meandering heat exchange channel is formed in the heat exchanger (4). Gas flows from the lower ventilation pipe (403) to the upper ventilation pipe (403) in sequence. The first ventilation seat (401) is fixedly connected to and communicates with the top opening of the combustion furnace (3); The second ventilation seat (402) is fixedly connected to the outer side of the top of the combustion furnace (3) and communicates with the air inlet of the exhaust mechanism (5); The combustion furnace (3) generates high-temperature flue gas which flows through the meandering heat exchange channel in the heat exchanger (4) under the traction of the exhaust mechanism (5) and is finally discharged by the exhaust mechanism (5).

3. The hot air circulating agricultural product drying device according to claim 2, characterized in that: The first ventilation seat (401) and / or the second ventilation seat (402) are provided with a sealing door (404) that can be opened and closed, and the first ventilation seat (401) and / or the second ventilation seat (402) are provided with a first door lock structure (405) for unlocking or locking the sealing door (404).

4. The hot air circulating agricultural product drying device according to claim 1, characterized in that: The combustion furnace (3) is provided with a combustion chamber (301) inside, and a material conveying mechanism (7) is provided outside the combustion chamber (301); The material conveying mechanism (7) includes a material cylinder (701) and a feeding screw (702) rotatably disposed in the material cylinder (701). The material cylinder (701) has an opening, and a feeding bin (703) for discharging combustibles is fixed on the opening. The material conveying mechanism (7) also includes a movable frame (704) with movable wheels at the bottom. The material cylinder (701) is fixed on the movable frame (704). The discharge end of the material conveying mechanism (7) is inserted into or moved away from the combustion furnace (3) through the movable frame (704).

5. The hot air circulating agricultural product drying device according to claim 4, characterized in that: The combustion furnace (3) is provided with an ignition chamber (302), which is located below the combustion chamber (301), and a metal ventilation grille (303) is provided between the ignition chamber (302) and the combustion chamber (301).

6. The hot air circulating agricultural product drying device according to claim 2, characterized in that: The exhaust mechanism (5) includes a flue pipe (501), a fan (502) and a flue pipe (503). The air inlet of the fan (502) is connected to the first end of the flue pipe (501), and the second end of the flue pipe (501) is connected to the second ventilation seat (402) of the heat exchanger (4). The flue pipe (503) is connected to the air outlet of the fan (502).

7. The hot air circulating agricultural product drying device according to claim 1, characterized in that: The hot air conveying mechanism (6) includes an air supply pipe (601), an air supply fan (602), and a fan mounting base (603). The first end of the air supply pipe (601) is connected to the heating chamber (2), and the other end of the air supply pipe (601) is connected to the drying chamber (1). The first end of the fan mounting base (603) is fixed to the upper part of the heating chamber (2), and the second end of the fan mounting base (603) is fixed to the air supply pipe (601). The air supply fan (602) is fixed inside the fan mounting base (603).

8. The hot air circulating agricultural product drying device according to claim 7, characterized in that: The air supply pipe (601) is inserted into the drying chamber (1), and several air outlet pipes (604) are provided on the outside of the air supply pipe (601). One end of the air outlet pipe (604) is connected to the air supply pipe (601), and the other end of the air outlet pipe (604) is connected to the drying chamber (1). The hot air in the air supply pipe (601) flows out along the several air outlet pipes (604) and is output to the drying chamber (1).

9. The hot air circulating agricultural product drying device according to claim 1, characterized in that: An internal pipe (8) is provided between the lower part of the drying chamber (1) and the lower part of the heating chamber (2). The internal pipe (8) connects the drying chamber (1) and the heating chamber (2) so that the hot air in the drying chamber (1) returns to the heating chamber (2) along the internal pipe (8). The drying chamber (1) is equipped with a fan (9) on the inner top wall to promote airflow, and the fan (9) blows air downwards towards the lower part of the drying chamber (1).

10. The hot air circulating agricultural product drying device according to claim 1, characterized in that: The drying chamber (1) is provided with a smoke exhaust seat (101) that connects the outside and inside of the drying chamber (1). The smoke exhaust seat (101) is located at the top of the drying chamber (1); or the smoke exhaust seat (101) is located near the outside of the lower part of the drying chamber (1). The drying chamber (1) is provided with a door (102) on the side. There are two doors (102), and a second door lock structure for locking or unlocking the doors is provided between the two doors (102). The bottom of the drying chamber (1) is equipped with casters (103); The heating chamber (2) is provided with a rotating door plate (201) corresponding to the heat exchanger (4), and a third door lock structure for locking or unlocking the rotating door plate (201).

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